Another question in my ongoing “educate the dummy†self help program
What is the optimum A/F ratio to aim for?
I have an engineering book that says max power ratio for gasoline powered piston engines is between 11:1(max power rich) and 13.8:1(max power lean).
While these figures are in the ballpark they are for aero engines that have large sloppy pistons and turn relatively slow. Not really precise enough for the high speed advanced engines that we are trying to get every reliable HP from.
Also, how is A/F determined on the dyno?
If an exhaust probe is used down the end can, will the readings be accurate if the pair valve is bleeding air into the exhaust flow?
While these might be simple enough questions for an experienced tuner, they might be good to know when talking to your local dyno dude. Lets face it, there are good ones and bad ones.
Any advice would be appreciated
Cheers
Ross
What is the optimum A/F ratio to aim for?
I have an engineering book that says max power ratio for gasoline powered piston engines is between 11:1(max power rich) and 13.8:1(max power lean).
While these figures are in the ballpark they are for aero engines that have large sloppy pistons and turn relatively slow. Not really precise enough for the high speed advanced engines that we are trying to get every reliable HP from.
Also, how is A/F determined on the dyno?
If an exhaust probe is used down the end can, will the readings be accurate if the pair valve is bleeding air into the exhaust flow?
While these might be simple enough questions for an experienced tuner, they might be good to know when talking to your local dyno dude. Lets face it, there are good ones and bad ones.
Any advice would be appreciated
Cheers
Ross